Compensating device for pumps



Feb. 2 1926.

R. H. ALDRICH COMPENSATING DEVICE FOR PUMPS Filed Dec. 22 1924 Patented Feb. 2, 1926.

UNITED STATE 1,571,781 PATENT OFFICE.

.ROSCOE HILTON ALDRICH, OF ALLENTOWN, PENNSYLVANIA.

COMPENSA'DING DEVICE FOR PUMPS.

Application filed December 22, 1924. Serial No. 757,550.

may be readily connected to any size pump and to efliciently function therewith.

Another object of the invention is to provide an improved compensating device, for

pumps wherein the actual discharge of the pump is maintained substantially at the theoretical discharge.

A still further object ofvthe invention is to provide an improved compensating device wherein means areprovid'ed which will withdraw from the discharge a certain proortion of the liquid being pumped when the discharge is above the vertical discharge and will return some of the matter being pumped to the discharge-when the pump is discharging below the vertical discharge.

In the accompanying drawing- 1 F1 re 1 is an elevation of a pump with certam parts broken away, together with an embodiment of the invention'applied to the pump.

Figure 2 is a sectional view through 1 Figure 1, approximately on line, 2-2.

In pumping water or other fluid, the discharge rises and falls as the various pistons function so that the discharge is done sometimes below the vertical discharge of the entire pump structure. To obviate this and to provide a substantially regular definite flow, air chambers or alleviators have been heretofore used but it has been found that these give only anapproximate compensation for the regular flow.

45 In the present invention, means have been provided which is adapted to compensate with reasonable accuracy for the irregular discharge of each cylinder of the pump be maintained-even throughout the action wherebythe discharge from the pump will pensate the dischargev of these three cylinders and to produce an even continuous flow, the compensating cylinder 2 is connected through pipe 3 to the pump 1 and opens into the discharge passage-way 4. From Figure 1 it will be noted that the valve 5 is the discharge valve while valve 6 is the suction or intake valve. The compensating chamber pr cylinder 2 may be of any desired size and may be provided with an ordinary piston if desired, though ordinarily, it is provided with a compensatin plunger 7 which passes through a suita le guide 8, which guide may be a packing gland if desired. However, it has beenfound convenient to provide a packing member 9 in the cylinder 7, said] packing member being held in place by an internal annular bead 10. This packing may be fiber, leather,

rubber or other material: Extending upwardly from the plunger 7 is a' compensat ing connector or rod 11 pivotally connected at 12 with the link 13 pivotally mounted at 14 on the engine 1 or on any other desired support. Preferably, an anti-friction roller 16 is positioned-at the upper end of the rod 11 so as to readily contact with the surface of the compensating cam 15. This cam is provided with an irregular cam surface adapted to properly compensate the particular action of the particular pump with which it is connected. It will be noted that this cam is keyed or otherwise rigidly secur ed to the crank shaft of the pump so as to rotate therewith and to function in time with the pistons of the pump. The construction just described is intended to rectify the irregularity in the discharge flow from pump 1 so as to produce a continuous velocity.

When the flow fromthe pump 1 is greater than the vertical discharge, the cam 5 is so arranged that the plunger 7 moves upwardly and, therefore, permits the water or other fluid to pass into the cylinder 2 out of the discharge chamber 4 until the flow from the discharge chamber 4 corresponds to the vertical flow. When the pistons of any of the pump cylinders produce a lower velocity of discharge than the vertical flow, then the cam 15 automatically moves the plunger 7 downwardly and pushes the water back into the discharge chamber 4 and thereby equalizes the flow. By this construction and arrangement and by the use-of a suitable cam 15, any compensation can be secured with any type oi pump regardless of the number of plunger-s used and. therefore. a continuous flow secured. it will, of course, be understood that a cam 15 for each particular type of pump must be secured, said cam also corresponding to the size of the plunger in capacity to the pump in question.

"What I claim is:

1. it compensating device for pumps, comprising a compensating cylinder, a plunger extending into said cylinder. means for connecting one end of said cylinder to the discharge of the pump, a cam for causing said plunger to move into the compensating cylinder at the proper time for increasing the flow "from said pump to maintain said flow substantially at its vertical discharge point.

2. The combination with a pump, of a compensating device for causing a continuous even flow, said compensating device comprising a compensating cylinder, means forming a passage-way between the bottom of the compensating cylinder and the discharge chamber of the pump, a plunger extending into said cylinder and adapted to be moved in a direction away from the bottom of the cylinder when the flow from the pump attempts to increase. and a cam operated by the pump for moving the plunger toward the bottom of the compensating cylinder when the flow from the pump begins to decrease.

3. In a compensating device for pumps, a

warmer compensating cylinder connected with the pump, a piston carried by said cylinder, and an arc-shaped cam operated by said pump, said cam having raised portions and depressed portions for causing the plunger to be depressed at one time and released at another according to the condition of flow from said pump.

4-7. The combination with a pump, of a compensating cylinder connected at one end with the discharge opening of the pump, a plunger extending into said cylinder, a pivotally mounted link pivotally connected with the upper end of the plunger and a cam con nected with the crank shaft of the piston and acting on said plunger for moving the same in one direction. said cam being formed with a suitable form of face to move the plunger in proportion to the amount of liquid needed to maintain the flow from the pump at substantially the same velocity at all times.

5. The combination with a pump, of a compensating cylinder connected with the discharge chamber thereof, a plunger extending into said cylinder, and a compensating structure co-acting with said plunger and actuated by the pump for causing the plunger to move in the cylinder in proportion to the amount of liquid necessary to maintain the How from the pump continuous.

ROSGOE HILTON ALDRICH. 

